;(() => {
// 存储原始传入的名称
    let pkg_name_origin = null;
    const npmInstall = (originName) => {
        // Trim string
        const name = originName.trim();
        pkg_name_origin = name;
        // 三种引入方式
        // 如果是一个有效的URL，直接通过<script />标签插入
        if (/^https?:\/\//.test(name)) return injectScript(name);
        // 如果指定了版本，尝试使用unpkg加载
        if (name.indexOf('@') !== -1) return unpkg(name);
        // 否则，尝试使用cdnjs搜索
        return cdnjs(name);
    };

// 在页面中插入<script />标签
    const injectScript = (url) => {
        const script = document.createElement('script');
        script.src = url;
        script.onload = () => {
            console.log(pkg_name_origin, ' 安装成功。');
        };
        script.onerror = () => {
            console.log(pkg_name_origin, ' 安装失败。');
        };
        document.body.appendChild(script);
        // document.body.removeChild(script);
    };

    const unpkg = (name) => {
        injectScript(`https://unpkg.com/${name}`);
    };

    const cdnjs = async (name) => {
        const searchPromise = await fetch(
            `https://api.cdnjs.com/libraries?search=${name}`,
            // 不显示referrer的任何信息在请求头中
            { referrerPolicy: 'no-referrer' }
        );
        const { results, total } = await searchPromise.json();
        if (total === 0) {
            console.error('Sorry, ', name, ' not found, please try another keyword.');
            return;
        }

        // 取结果中最相关的一条
        const { name: exactName, latest: url } = results[0];
        if (name !== exactName) {
            console.log(name, ' not found, import ', exactName, ' instead.');
        }
        // 通过<script />标签插入
        injectScript(url);
    };
    console.log(window.$install)
    if (typeof window.$install === 'undefined') {
        window.$install = npmInstall
    } else {
        console.log('$install 已经被使用，插件失效')
    }
})()
